/Engine/Plugins/Experimental/CharacterFXEditor/BaseCharacterFXEditor/Source/BaseCharacterFXEditor/Public/BaseCharacterFXEditorToolkit.h
Called fromFBaseAssetToolkit::CreateWidgetsto populate ViewportClient, but otherwise only used in our own viewport delegate
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FEditorViewportClient](API\Editor\UnrealEd\FEditorViewportClient) > CreateEditorViewportClient() const